Trigonometry

Non-Right-angled Triangles

For any triangle:

Area = 1/2(abSinC)

Sine Rule

(SinA/a) = (SinB/b) = (SinC/c) --- to work out the angle, will rearrange to:
A = Sin-1(aSinB/b) and for the side length:
a = (SinAb/SinB)Note it will work with C and c as well as B and b
The Sine Rule requires at least one pair of angle and triangle!